<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <form action="/customLogin" method="post">
        账号：<input name="username" type="text" /> <br />
        密码：<input name="password" type="password" /> <br />
        验证码：<input name="captcha" type="text" /> <img src="/captcha" onclick="this.src='/captcha?' + Math.random()"> <br />
        <input type="submit" value="登录">
    </form>
</body>
</html>